ceph/src/boost/libs/context/src/asm/ontop_arm64_aapcs_macho_gas.S

   1 /*
   2             Copyright Edward Nevill + Oliver Kowalke 2015
   3    Distributed under the Boost Software License, Version 1.0.
   4       (See accompanying file LICENSE_1_0.txt or copy at
   5           http://www.boost.org/LICENSE_1_0.txt)
   6 */
   7 /*******************************************************
   8  *                                                     *
   9  *  -------------------------------------------------  *
  10  *  |  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |  *
  11  *  -------------------------------------------------  *
  12  *  | 0x0 | 0x4 | 0x8 | 0xc | 0x10| 0x14| 0x18| 0x1c|  *
  13  *  -------------------------------------------------  *
  14  *  |    x19    |    x20    |    x21    |    x22    |  *
  15  *  -------------------------------------------------  *
  16  *  -------------------------------------------------  *
  17  *  |  8  |  9  |  10 |  11 |  12 |  13 |  14 |  15 |  *
  18  *  -------------------------------------------------  *
  19  *  | 0x20| 0x24| 0x28| 0x2c| 0x30| 0x34| 0x38| 0x3c|  *
  20  *  -------------------------------------------------  *
  21  *  |    x23    |    x24    |    x25    |    x26    |  *
  22  *  -------------------------------------------------  *
  23  *  -------------------------------------------------  *
  24  *  |  16 |  17 |  18 |  19 |  20 |  21 |  22 |  23 |  *
  25  *  -------------------------------------------------  *
  26  *  | 0x40| 0x44| 0x48| 0x4c| 0x50| 0x54| 0x58| 0x5c|  *
  27  *  -------------------------------------------------  *
  28  *  |    x27    |    x28    |    FP     |     LR    |  *
  29  *  -------------------------------------------------  *
  30  *  -------------------------------------------------  *
  31  *  |  24 |  25 |  26 |  27 |  28 |  29 |  30 |  31 |  *
  32  *  -------------------------------------------------  *
  33  *  | 0x60| 0x64| 0x68| 0x6c| 0x70| 0x74| 0x78| 0x7c|  *
  34  *  -------------------------------------------------  *
  35  *  |     PC    |   align   |           |           |  *
  36  *  -------------------------------------------------  *
  37  *                                                     *
  38  *******************************************************/
  39
  40 .text
  41 .global _ontop_fcontext
  42 .balign 16
  43 _ontop_fcontext:
  44     # prepare stack for GP + FPU
  45     sub  sp, sp, #0x70
  46
  47     # save x19-x30
  48     stp  x19, x20, [sp, #0x00]
  49     stp  x21, x22, [sp, #0x10]
  50     stp  x23, x24, [sp, #0x20]
  51     stp  x25, x26, [sp, #0x30]
  52     stp  x27, x28, [sp, #0x40]
  53     stp  x29, x30, [sp, #0x50]
  54
  55     # save LR as PC
  56     str  x30, [sp, #0x60]
  57
  58     # store RSP (pointing to context-data) in X5
  59     mov  x4, sp
  60
  61     # restore RSP (pointing to context-data) from X1
  62     mov  sp, x0
  63
  64     # load x19-x30
  65     ldp  x19, x20, [sp, #0x00]
  66     ldp  x21, x22, [sp, #0x10]
  67     ldp  x23, x24, [sp, #0x20]
  68     ldp  x25, x26, [sp, #0x30]
  69     ldp  x27, x28, [sp, #0x40]
  70     ldp  x29, x30, [sp, #0x50]
  71
  72     # return transfer_t from jump
  73     # pass transfer_t as first arg in context function
  74     # X0 == FCTX, X1 == DATA
  75     mov x0, x4
  76
  77     # skip pc
  78     # restore stack from GP + FPU
  79     add  sp, sp, #0x70
  80
  81     # jump to ontop-function
  82     ret x2